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Paper IPM / P / 15343  


Abstract:  
In the present study we explore the recently observed Ξ_{b}(6227)^{−} resonance to fix its quantum numbers. To this end we consider various possible scenarios: it can be considered as either orbital/radial excitations of the Ξ_{b}^{−} and Ξ_{b}′(5935)^{−} ground state baryons with spin[1/2] or orbital/radial excitations of the ground state Ξ_{b}(5955)^{−} with spin[3/2]. We calculate the masses of the possible 1P and 2S excited states corresponding to each channel employing the QCD sum rule technique. It is seen that all the obtained masses are in agreement with the experimentally observed value implying that the mass calculations are not enough to distinguish the quantum numbers of the state under question. Therefore we extend the analysis to investigate the possible decays of the same excited states into Λ_{b}^{0} K^{−} and Ξ_{b}^{−}π. Using the light cone QCD sum rule method we calculate the corresponding strong coupling constants, which are used to extract the decay widths of the modes under consideration. Our results on decay widths indicate that the Ξ_{b}(6227)^{−} is 1P orbitally excited state of the Ξ_{b}(5955)^{−} baryon with quantum numbers J^{P}=[3/2]^{−}.
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